I'm tired of the regular stuff, the chicken and beef and so on. I want to explore the world of offal. Anybody had good restaurant experiences with kidneys, tripe, crackling, trotters, sweetbreads and so on? I don't mean upscale French, I mean ethnic restaurants that don't shy away from cooking with this stuff. The tacos de cabeza or chicharon I've had in Mexico come to mind, or the tripe soup there, or the rice with pollo de sangre in Spain.